My Dad has kept a lot, under the mind-set "They've only been used once". 20 years ago I stocked a bunch of bins with new grade 5 and grade 8 hardware. Never should have done it, as I still have half of it, and their lengths that just won't get used. Now I buy as I need it. Had a friend who bought a guys garage out to settle a divorce. I got three or four milk crates of oddball fasteners, heim's, clevises.....I finally got that whittled down.